Why I built this

Football has always been with me, whether I wanted it or not. My father passed it down. He was a good player himself. Growing up in Saint-André, Réunion, it was Sunday matches at the stadium with him, roasted peanuts in paper cones, cheering for the USSA Léopards from the stands before I was old enough to play for them myself.

In 1998, my dad was living in France for work. He sent me the official World Cup ball from there. I was 11. Zidane, the Ballon d'Or, our first World Cup. That year is burned into me.

Life happened after that. But football stayed in the background. Twenty years later, our second World Cup. A different person by then, living in Paris. And recently, our first European Championship. Today I live in Stockholm, where the stadium culture hits different. För alltid för Hammarby.

I work in marketing, spend my days with LLM tools and automation workflows. A while back I started looking into alternative investments. The EU football card market felt underserved compared to the US. No real price tools, no fair value data, nothing built for European collectors. So I built the tools for myself first, then figured: why not share them.

How BallnX works

Fair price is calculated from the median of actual sold transactions, not asking prices. Asking prices on eBay run 15–40% above what cards actually sell for. We use real sales.

European marketplaces. Listings are fresh. Sold data daily. Card ID at scale, for a selected group of players on purpose.

A card shows as a “deal” when its current listing price sits below the median sold price for that exact card in the same condition tier.